fix: update LICENSE and README to include third-party licenses for SciencePlots; enhance references in pp_base.mplstyle

Author: c0rychu

LICENSE

@@ -27,7 +27,9 @@ SOFTWARE.
 ### Third-Party Licenses
 
 This project includes or adapts files from:
-- **Matplotlib** (BSD-compatible license)
+- [**SciencePlots**](https://github.com/garrettj403/SciencePlots) (MIT License)
+  Copyright (c) 2018 John Garrett
+- [**Matplotlib**](https://github.com/matplotlib/matplotlib) (BSD-compatible license)
   Copyright (c) 2012– Matplotlib Development Team
-- **Seaborn** (BSD 3-Clause License)
+- [**Seaborn**](https://github.com/mwaskom/seaborn) (BSD 3-Clause License)
   Copyright (c) 2012–2023, Michael L. Waskom

README.md

@@ -70,6 +70,8 @@ license.
 
 ### Third-Party Licenses
 This project includes or adapts files from:
+- [**SciencePlots**](https://github.com/garrettj403/SciencePlots) (MIT License)
+  Copyright (c) 2018 John Garrett
 - [**Matplotlib**](https://github.com/matplotlib/matplotlib) (BSD-compatible license)
   Copyright (c) 2012– Matplotlib Development Team
 - [**Seaborn**](https://github.com/mwaskom/seaborn) (BSD 3-Clause License)

src/physics_plot/pp_base.mplstyle

@@ -1,7 +1,7 @@
 # Author: Cory Chu <[email protected]>
 # Repository: https://github.com/c0rychu/physics-plot
 #
-# Reference:
+# This style sheet is based on the combination of these two sources:
 # https://blog.gwlab.page/beautiful-plots-by-matplotlib-b5ca9fe2765f
 # https://github.com/garrettj403/SciencePlots/blob/master/scienceplots/styles/science.mplstyle